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Paper   IPM / Astronomy / 16383
School of Astronomy
  Title:   Generalized energy-momentum-squared gravity in the Palatini formalism
  Author(s): 
1.  Elham . Nazari
2.  Farahnaz . Sarvi
3.  Mahmood . Roshan
  Status:   Published
  Journal: Phys. Rev. D
  Vol.:  102
  Year:  2020
  Supported by:            ipm IPM
  Abstract:
We study the generalized version of energy-momentum squared gravity (EMSG) in the Palatini formalism. This theory allows the existence of a scalar constructed with energy-momentum tensor as TαβTαβ in the generic action of the theory. We study the most general form of this theory in the Palatini framework and present the underlying field equations. The equations of motion of a massive test particle have been derived. The weak field limit of the theory is explored and the generalized version of the Poisson equation is obtained. Moreover, we explore the cosmological behavior of the theory with emphasis on bouncing solutions. Some new bouncing solutions for the specific Palatini EMSG model given by the Lagrangian density L=R+βR2+ηTμνTμν are introduced. We show that only the case η>0 can lead to viable cosmic bounce.

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